Where would you use a foam fire extinguisher?

Answer 1

"foam" fire extinguishers are made for hydrocarbon fires...i.e: gasoline, diesel, etc. These fires are considered class "b" (flammable liquids), and are mostly used by professionals and in commercial and industrial settings. These extinguishers are charged with anther AFFF, FFFP, or AR-AFFF, however, these class of extinguishers are only rated class A & B fires and are hazardous to the environment, humans and animals in addition to being very corrosive.

Answer 2

You would use a foam fire extinguisher if the oven cought on fire or if a flammable item cought on fire then you can extinguish the flames and then the foam left behind would prevent it from catching fire again.